Diaphragm pump



FIG. 1 is a perspective view of a diaphragm pump showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left elevation view thereof; and,

FIG. 7 is a right elevation view thereof.

The structural features depicted by means of broken lines in the drawing figures have been shown for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a diaphragm pump, as shown and described. 